/*_############################################################################
  _## 
  _##  SNMP4J 2 - SecurityLevel.java  
  _## 
  _##  Copyright (C) 2003-2011  Frank Fock and Jochen Katz (SNMP4J.org)
  _##  
  _##  Licensed under the Apache License, Version 2.0 (the "License");
  _##  you may not use this file except in compliance with the License.
  _##  You may obtain a copy of the License at
  _##  
  _##      http://www.apache.org/licenses/LICENSE-2.0
  _##  
  _##  Unless required by applicable law or agreed to in writing, software
  _##  distributed under the License is distributed on an "AS IS" BASIS,
  _##  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  _##  See the License for the specific language governing permissions and
  _##  limitations under the License.
  _##  
  _##########################################################################*/

package org.snmp4j.security;

/**
 * The <code>SecurityLevel</code> interface contains enumerated values
 * for the different security levels.
 *
 * @author Frank Fock
 * @version 2.0
 */
public enum SecurityLevel {
    undefined(0), noAuthNoPriv(1), authNoPriv(2), authPriv(3);

    /**
     * No authentication and no encryption.
     * Anyone can create and read messages with this security level
     */
    public static final int NOAUTH_NOPRIV = 1;

    /**
     * Authentication and no encryption.
     * Only the one with the right authentication key can create messages
     * with this security level, but anyone can read the contents of
     * the message.
     */
    public static final int AUTH_NOPRIV = 2;

    /**
     * Authentication and encryption.
     * Only the one with the right authentication key can create messages
     * with this security level, and only the one with the right
     * encryption/decryption key can read the contents of the message.
     */
    public static final int AUTH_PRIV = 3;

    private int snmpValue;

    private SecurityLevel(int snmpValue) {
        this.snmpValue = snmpValue;
    }

    /**
     * Gets the SNMP value of this security level.
     * @return
     *    1 for noAuthNoPriv
     *    2 for authNoPriv
     *    3 for authPriv
     */
    public int getSnmpValue() {
        return snmpValue;
    }

    public static SecurityLevel get(int snmpValue) {
        switch (snmpValue) {
            case NOAUTH_NOPRIV: {
                return SecurityLevel.noAuthNoPriv;
            }
            case AUTH_NOPRIV: {
                return SecurityLevel.authNoPriv;
            }
            case AUTH_PRIV: {
                return SecurityLevel.authPriv;
            }
        }
        return SecurityLevel.undefined;
    }
}
